Nah, the in-game model is already there on several early screens and videos.View attachment 1652
It's usually shown on Liara though, so it may be kept just for the NPC. Seen it on other Aurin once or twice I think.

Maybe it's some sort of a XAS uniform obtainable through reputation?

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I think this is more likely, or that this is a subtle glimpse at end game gear.

Is she wearing earrings? If so, does she have two sets of ears or what the heck is going on?

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I paused the Debut Trailer right when she turns her head so you can see in between the "earrings" and her hair. They seem to be hanging from the side of her face, no second set of ears seem to be present. Or maybe they're attached to the inside arc of her hair-do? Though according to this picture there is definitely space between the face and the "earring."

Unfortunately, I can't seem to upload the picture. But you can see what I'm talking about at 0.37s into the debut trailer on wildstar-online.com .

In summation:

Theory 1: The "earrings" are hanging from the side of her face (ouch).

Theory 2: The "earrings" are attached to the inner arc of her hair-do.

Theory 3: The "earrings" are suspended mid-air by super-science awesomeness.

But I think we can all agree that she's probably only wearing them to fit in with the exile humans.